Bug 186044 - Graphical installer cannot be used with flatpanel displays
Summary: Graphical installer cannot be used with flatpanel displays
Alias: None
Product: Fedora
Classification: Fedora
Component: rhpxl
Version: 5
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Chris Lumens
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 2006-03-21 10:04 UTC by Jaakko Hyvätti
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Clone Of:
Last Closed: 2006-07-19 14:36:09 UTC

Attachments (Terms of Use)

Description Jaakko Hyvätti 2006-03-21 10:04:20 UTC
Description of problem:
When graphical installation starts the X server, it uses vertical refresh rates
beyond the flat panel capabilities, at least with ViewSonic VP171b-2.  The flat
panels generally top out below 85 Hz, and the X server is started at vertical
freq above 85 Hz.  Therefore, only text mode installation is possible with flat

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Actual results:

Expected results:

Additional info:

Comment 1 Jaakko Hyvätti 2006-03-21 10:43:45 UTC
linux resolution=1280x1024 worked with my flat panel now.  That should not be

Comment 2 Jeremy Katz 2006-03-21 16:45:11 UTC
Unfortunately, we generally can't probe a lot of useful information in a generic
fashion for LCDs.  What's the output of ddcprobe?

Comment 3 Jaakko Hyvätti 2006-03-22 03:05:02 UTC
The monitor displays frequences as 'Out Of Range, H.Frequency: 54 kHz,
V.Frequency 86.6 Hz'.  Sometimes it goes to 86.9 Hz.  I am using DVI.  Below is
the ddcprobe:

Videocard autoprobe results
Description:  (C) 1988-2003, ATI Technologies Inc. R430
Memory (MB):  16

Monitor autoprobe results
ID: VSC4c1b
Name: VP171b-2
Horizontal Sync (kHZ): 30-82
Vertical Sync (HZ)  : 50-85
Width (mm): 340
Height(mm): 270

Comment 5 Jacek Piskozub 2006-03-24 15:01:39 UTC
I had the same problem installing FC5 on an Acer Travelmate 4100.

Comment 6 Chris Lumens 2006-05-11 15:04:28 UTC
Looks like we need to use Option "DDCMode" "on", but only in some cases. 
Investigating when to do that and when not.

Comment 7 Chris Lumens 2006-05-30 18:09:49 UTC
This should be better in the next build.

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